Reading Input value typed by user. How

:kir: Hi, im a begineer needing some help Thankyou!

i have 2 input box and 1 dynamic box.

What is the actionscript to make then 2 input box read the value that a user typed in(automaticly if possible without a button)?
which then my other script will process a calculation between them to give the answer.

I just need the answer for the bolded text~ thankyou everyone! :flower:

appreciated.